Hot-air heater.



PATBNTED lDEG. 22, 1903.

R.V H. BRADLEY.

HOT AIR HEATER.

APPLICATION FILED FEB. 14, 1903. l

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PATENT OFFICE.

ROYAL H. BRADLEY, OF SYRACUSE, NEW YORK, ASSIGNOR TO KELSEY HEATINGCOMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

HOT-Ala HEATER.

SSPECIFICATION forming part of Letters ljatent No. 7??,904, datedDecember 22, 1903. Application filed February 14. 1903. Serial No.143,312. (No model.)

To @ZZ whom it may concern:

Be it known that I, ROYAL H. BRADLEY, o Syracuse, in the county ofOnondaga, in the State of New York, have invented new and usefulImprovements in Hot-Air Heaters, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention relates 'to improvements in hot-air heaters or furnaces,and refers more particularly to the heatradiating section therefor.

The object of my present invention is to produce a hollowcast-iron orsimilar section which is adapted to receive the products of combustionfrom a combustion-chamber and in which the lower and upper walls are soarranged as to deflect any soot or ashes which may tend to accumulatethereupon back into the combustion-chamber, the said shell lor sectionbeing provided with vertical'air-flues extending through its lower andupper walls outside of thecombustion-chamber, through which the air mayreadily pass from beneath the section into a suitable receiving-chamberabove the section, from which the heated air may be conveyed to anydesired locality, the air-fines being arranged so that the products ofcombustion entirely surround the portions extending through the interiorof the section.

Another object is to provide abaffle-plate which forms an integral partof the section -and is located between the outlet and com- Incarrying'out the objects of this invention I provide a cast-iron shellor heatingsection l, with lower and upper walls 2 and 3 and side walls4, said section being substantially circular in top plan, and its upperand lower walls are connected by air-feeding lines 5 and a bale-plate 6.

The lower wall 2 is constructed in the form vof an invertedcone'somewhat flat and truncated at its lower end, said lower end orapex being provided with a central opening 7, which communicates withthe combustionchamber 8 of a heater 9. It will th us be seen that thebottom wall flares outwardly and upwardly from the opening 7, the objectof this being to cause the soot or ashes which may tend .to accumulateon the bottom wall to precipitate or gravitate back into thecombustion-chamber.8,'thus maintaining a substantially clean surface,and thereby increasing `the efflciencyofthe heating-section. It is wellknown that soot and similar accumulations upon the surface of aradiator-section of this character form a coating of heat-refractorysubstance which nullities the purposes of the heating-section--that is,it prevents the rheating of the walls of the section, and thereforeprevents the section from performing its heat-radiating function forheating the surrounding air-and by sloping the bottom wall downwardlyand inwardly toward the opening 7 this accumulation is almost entirelyobviated. Another purpose of inclining this bottom wall upwardly fromthe inlet-opening-is to permit the heated products of combustion toexpand gradually and to therebyT impinge against the bottom wall afterleaving the combustion-chamber 8, so

that the bottom wall forms'an efficient. radiating-body. In like mannerthe upper wall is also dished or depressed at the center, the apexbeingdirectly over the center of the vopening 7, so that the products ofcombustion are deflected laterally in all directions against the innerface of the upper wall. By

this construction a greater radiating-surface the side walls el, thusheating the section throughout its entire surface. Another feature orobject of this construct-ion of the upper and side walls is that theproducts of combustion are deflected with considerable force laterallyalong the inner surfaces of the upper and side walls and then downwardlyagainst the bottom wall, which establishes a strong current of hot airimpinging against the bottom wall and operating to loosen and convey anyaccumulated soot or ashes back into the opening 7.

A smoke-flue 11 is provided in one of the side walls of the section 1and forms an outlet :for the products of combustion after pass ingthrough the interior of the heater-section 1, the ballleplate6beinginterposed between the inner end of the ue 11 and the adjacent sideof the opening 7, said baille-plate being disposed in a substantiallyvertical position between the upper and lower walls 2 and 3 and alsobetween two of the air-dues 5, which are located at opposite sides ofthe outlet-opening 11, as best seen in Figs.v 1 and 3.

The'flues 5 extend through the interior of the section 1 and continuethrough the lower and upper walls 2 and 3, said flues being preferablyarranged concentrically around the opening 7 and connect the spacesurrounding the upper end of the heater 9 with the space above thesection 1, thereby forming air-channels through which the air passes andis heated, or rather superheated, during its transit through the flues,said heater-sec Ation 1 and heater 9 being usually inclosed in a jacket12, which is provided with air-outlets 13, adapted to be connected todistribnte-pipes not necessary to further illustrate or describe.

The airflues 5 are preferably contracted or of less diameter midwaybetween their opposite ends7 the lower ends tapering upwardly and theupper ends tapering downwardly,

the object of this being to retard the passage of air through the dues,so that it may become heated to a greater degree than would be the caseif l[he lues were of the same diameter from top to bottom.

In the operation of my invention the products of combustion passupwardly through the opening 7 and are reiiected backwardly by reason ofthe intel-position of the baffleplate 6 between the passage 7 andsmoke-flue 11, thereby causing the air to circulate around all the uesbefore passing out through the outlet 11, aud it is evident that by thisconstruction the section lis heated to a maximum degree with a minimumquantity of fuel and that the air which surrounds and passes through thesection is therefore similarly heated to a high degree before passingthrough the distributing-pipes 13.

Having thus described my invention, what Iclaim, and desire to secure byLetters Patent, is l In combination with the com bustion-cham ber of aheater, a hollow heater-section having lower and upper walls, thecentral portion of each being depressed and the lower wall beingprovided with a central opening communicating with thecombustion-chainber, air-ues arranged concentrically around the openingand extending through the upper and lower walls of the section, saidsection having a smoke-outlet and a baille-plate connecting the adjacentwalls of two of the air-fines, said baille-plate being` located betweenthe inner end of the smoke-outlet and the adjacent side of the openingin the bottom wall.

In witness whereof I have hereunto set my hand this 12th day ofFebruary, 1903.

ROYAL H. BRADLEY. Vitnesscs:

H. E. CHASE, MILDRED M. NoTT.

